نتایج جستجو برای: homogeneous co oligomerization of olefins

تعداد نتایج: 21201291  

Journal: :Science 2011
Tianbo Liu Melissa L K Langston Dong Li Joseph M Pigga Céline Pichon Ana Maria Todea Achim Müller

We report a self-recognition phenomenon based on an assembly process in a homogeneous dilute aqueous solution of two nano-scaled, spherical polyprotic metal oxide-based macroions (neutral species in crystals), also called Keplerates of the type [(linker)₃₀(pentagon)₁₂]≡[{M(H₂O)}₃₀{(Mo)Mo₅}₁₂] where M is Fe(III) or Cr(III). Upon deprotonation of the neutral species, the resulting macroions assem...

Journal: :The Journal of biological chemistry 2011
Doreen Nothmann Ariane Leinenweber Delany Torres-Salazar Peter Kovermann Jasmin Hotzy Armanda Gameiro Christof Grewer Christoph Fahlke

Excitatory amino acid transporters (EAATs) mediate the uptake of glutamate into neuronal and glial cells of the mammalian central nervous system. Two transporters expressed primarily in glia, EAAT1 and EAAT2, are crucial for glutamate homeostasis in the adult mammalian brain. Three neuronal transporters (EAAT3, EAAT4, and EAAT5) appear to have additional functions in regulating and processing c...

2017
Xinjiang Cui Kathrin Junge Xingchao Dai Carsten Kreyenschulte Marga-Martina Pohl Sebastian Wohlrab Feng Shi Angelika Brückner Matthias Beller

Catalytic hydrosilylation represents a straightforward and atom-efficient methodology for the creation of C-Si bonds. In general, the application of homogeneous platinum complexes prevails in industry and academia. Herein, we describe the first heterogeneous single atom catalysts (SACs), which are conveniently prepared by decorating alumina nanorods with platinum atoms. The resulting stable mat...

M . Mazloum-Ardakani Maryam Mahdavi Matin Mohsen Hakimi,

In this paper, the effect of the structural properties and morphology of iron oxide product, have been studied in co-precipitation and hydrothermal methods. Also, the effect of adding CCl4 impurities and final annealing of the materials is taken into account. The more homogeneous particle size in hydrothermal method has been explained by the effect of adding CCl4 as impurities to prevent the co...

Journal: :Journal of the American Chemical Society 2006
Jérôme Waser Boris Gaspar Hisanori Nambu Erick M Carreira

The discovery, study, and implementation of the Co- and Mn-catalyzed hydrohydrazination and hydroazidation reactions of olefins are reported. These reactions are equivalent to direct hydroaminations of C-C double bonds with protected hydrazines or hydrazoic acid but are based on a different concept in which the H and the N atoms come from two different reagents, a silane and an oxidizing nitrog...

2014
Graham E. Dobereiner Gulin Erdogan Casey R. Larsen Douglas B. Grotjahn Richard R. Schrock

A tandem catalytic reaction has been developed as part of a process to discover tungsten-based olefin metathesis catalysts that have a strong preference for terminal olefins over cis or trans internal isomers in olefin metathesis. This tandem isomerization/terminal olefin metathesis reaction (ISOMET) converts Cn trans internal olefins into C2n−2 cis olefins and ethylene. This reaction is made p...

Journal: :Catalysts 2023

The pretreatment atmosphere has a significant impact on the performance of iron-based catalysts in carbon dioxide (CO2) hydrogenation. In this study, we investigated effects monoxide (CO), syngas (H2/CO), and hydrogen (H2) during process. To evaluate structural changes after activation reaction, analyzed their morphology particle size, surface bulk phase composition, deposition, desorption line...

Journal: :Chemical communications 2001
G S Papaefstathiou A J Kipp L R MacGillivray

Co-crystallization of 1,8-naphthalenedicarboxylic acid (1,8-nap) with trans-1,2-bis(n-pyridyl)ethylene (n,n'-bpe) (n = 2 or 4) yields a discrete four-component molecular assembly, 2(n,n'-bpe).2(1,8-nap) 1, that is held together by four O-H...N hydrogen bonds where the dicarboxylic acid, serving as a linear template, directs alignment of olefins in the solid state for [2 + 2] photoreaction.

Journal: :Journal of the American Chemical Society 2001
K Chiba T Miura S Kim Y Kitano M Tada

Electrochemical reactions have proven to be valuable means for reversing the polarity of alkenes and triggering radical anionor radical cation-based cyclizing reactions. Anodic olefin coupling initiated by oxidation of electronrich olefins can provide powerful tools for achieving intramolecular cyclization reactions and building new ring systems. In this case, several combinations of olefins ca...

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